Applicator for ion traps



April 17, 1951 HOPPS APPLICATOR FOR ION TRAPS Filed Oct. 1, 1949 f2: VE'ZiZL UT" Lezu w fio o os Patented Apr. 17, 1951 APPLICATOR FOR ION TRAPS Lewis Hopps, Darien, Conn., assignor to The Indiana Steel Products Company, Chicago, 111.,

a corporation of Illinois Application October 1, 1949, Serial No. 119,132

1 Claim.

This invention relates to means for applying resiliently clamped assemblies to the neck portions'of cathode ray tubes, and more particularly to a .device which facilitates application of 7 field structures of ion traps to the neck portions of oath ode ray tubes.

Fielcl structure assemblies for ion traps of television cathode ray tubes have heretofore usually been of the type which could be clamped about.

tube neck and slid into the desired position thereon. One form of the latter type of assembly is described in greater detail in a copending application in which I am a co-inventor with Philip A. Smith entitled Ion Trap and Centering Magnet Assembly, Serial No. 119,133, filed October 1', 1949. This type of field. structure assembly utilizes clamping means of spring material capable of being resiliently expanded as the structure is slipped into position on the outer periphery of the member on which it is to be clamped. Thus in mounting the field structure on a cathode ray tube, it is preferable that means be provided that are operative during the mounting operation to facilitate the slipping of the assembly over the socket and onto the neck of the tube.

It is, therefore, a particular object of the pres ent invention to provide a novel and simple means for facilitating the mounting of spring clamp type ion trap field structures on cathode ray tubes.

Still another object of the present invention is to provide novel means for mounting spring clamp type ion trap field structures on cathode ray tubes for television sets, which means will and which will at the same time provide a simple means whereby the assembly may be slipped over the plug and onto the tube neck to the position desired.

The novel features which are believed to be characteristic of my invention are set forth with particularity in the appended claims. My invention, however, as to its organization and method of operation, together with. further objects and advantages thereof may best be understood b reference to the following description taken in connection with the accompanying drawings in which:

Figure l is a side elevational view of a conventional type of cathode ray tube illustrating in full and dotted lines the operation of mounting an ion trap field structure thereon with the aid of an applicator embodying the principles of the present invention;

Figure 2 is a perspective view of an applicator embodying the principles of the present invention;

Figure 3 is a fragmentary side elevational view of the assembly of the ion trap applicato-r on the end of a cathode ray tube plug preparatory to mounting an ion trap field structure on said tube;

Fig. 4 is an enlarged sectional view taken along the line IV-IV of Figure 1 Figure 5 is a plan View of the open end of the ion trap applicator; and

' Figure 6 is a plan View of the closed end of the ion trap applicator.

As shown on the drawings:

Figure 1 illustrates somewhat diagrammatically a cathode ray tube l0 while an ion trap assembly I I. is being mounted thereon by using an ion trap applicator l2 of the present invention; The cathode ray tube II] is of a type in general use for television reception purposes having an enlarged bulbular fan-shaped portion on which a viewing screen I3 is provided while the remainder of the tube comprises a relatively long also insure that the plug ends of such tubes willnot be damaged during the mounting operation. Another and still further object of the present invention is to provide a novel means for mounting ion trap field structures on cathode ray tubes of television sets which means will be both simple in construction and also readily adaptable to production assembly operations.

A still further object of the present invention is to provide a novel unitary device which will both protect the plug end of the television cathode ray tube during the operation of mounting a spring clamp assembly on the neck of the tube narrow tubular neck portion "I4 which encloses an electron gun IS. The narrow neck portion l4 terminates in a tube plug I6 of the same diameter as the tube neck and to which electrical connections of the inner tube elements are made. A plurality of prongs it of relatively short length project from the face of the plug I6, and the electrical elements Within the tube are connected thereto so that connections maybe made between the inner elements and external apparatus. V

One type of spring clamp assembly II which may be mounted by means OfthBfQDDIlCELtOI l2 of the present invention, as mentioned above, is described fully in a co-pending application entitled Ion Trap and Centering Magnet Assembly" Serial No. 119,133, filed October 1, 1949 for which I am a co-inventor with Philip A. Smith. This ion trap assembly ll comprises a pair of ring-shaped magnets and 2i which are held by a one-piece split spring-like clamping support member 22. The spring-like clamping support member 22 is made of thin flat nonmagnetic material, such as brass in the general form of an equilateral triangle. Notches are provided on each corner of the support to provide means for holding the ring magnets 20 and 2!. The triangular member 22 is normally not sufficiently large to enable it to be slipped over the plug 16 and onto the neck 14 of the cathode ray tube H! but for that purpose it is capable of, being spread or expanded within the ring magnets 29 and 2|. The sides of the triangle then become substantially bow-shaped, and the cross-sectional area bounded by the sides of the triangle be-. comes large enough for the assembly to be slipped over the plug l6 and onto the tube neck [4;

Without the use of an applicatorpas shown, the operation of expanding the resilient ring support member and at the same time carefully slipping the assembly over the tube socket and neck, to avoid damaging the tube plug and its,

prongs iii, would be a very cumbersome and time consuming operation and obviously does not readily lead itself to production assembly operations.

By utilizingan applicator i2, however, which is best shown in perspective in Figure 2, spring clamp'assemblies such as ion trap field structure assemblies may very easily be mounted on the necks of cathode ray tubes, and at the same time, the prongs of the plugs thereof will be protected from damage. The applicator i2 is preferably made of light material, such as aluminum, and is tapered along its length to provide a frustoconical shape so that the spring support member 22 of the assembly H will expand as it isv pushed thereover from the smaller end 26 towards the larger end 27. The larger end of theapplicator has the same outside diameter as the tube base-or plug it with which it is associated. A cylindrical recess 24 of a depth slightly greater than the length of the prongs i8 is concentrically provided in the face of the, larger end 2'! of the applicator and has a diameter such that the applicator will fit snugly over the prongs 18 which define a circular pattern in the base of the plug it. The smaller end 26 of the applicator l2 has an outside diameter less than that of the opening defined of support member 22 in its normal, unexpanded state.

Thus, when the applicator I2 is slipped over the prongs I8 in the manner shown in, Figure 3, the ion trap assembly I! may be mounted on the tube neck I4 by merely slipping it over the smallerend 25 of the applicator l2 and pushing-it toward the larger end 2! thereof until it reaches and surrounds the socket'lfi from which the assembly may be further slid onto the neck 14 to any desired position along the neck, such as the position in which it is shown in the dot-dash lines of Figure 1. It is apparent that after the assembly has been mounted in the desired position, the applicator l2 may be removed for use on other tubes.

The applicator may also be used in another way in view of the provision of the cylindrical shoulder portion 25 thereon at the largest end 21 thereof. Theuntapered portion 25 has the same diameter as the socket l6, and may be'utilized to expand and hold the spring support member 22 in its expanded relation until the applicator is inserted over the prongs 18. In other words, the applicator l2 need not be inserted over the prongs l8 before the assembly I I is expanded, but may be separately utilized -to first expand the spring member 22 to the size which will enable it to be slipped directly onto the plug 16.

It will be apparent to those skilled in the art that. the applicator which I have described for use in mounting ion trapassemblies on the necks of, cathode ray tubes, is not necessarily, limited tousein mountingion-trap assemblies alone but that almost any form ofspring clamp assemblies. which is tobe mounted, in surrounding relation on the necksiof, such tubes maybe mounted with.

great ease by use of the applicator which Ihave described.

While I 'haveshown and describeola particular.

embodiment of my invention, it will, of course,.

be understood that I do, not Wish to be limited.

thereto, since many modifications may be made,,

and I, therefore, contemplate by the appended claim to cover all such modifications that fall within the true spirit and scope of my invention.

I.claim,as myinventionz.

An applicator for mounting spring supported,

assemblies on the neck of a cathode ray tube having circularly arranged contacteprongs, said applicator comprising a one-piecemember having,

frustoconical wall portion and a joining cylindricalv wall portion extending from.the larger..di-

ameter end of said frustoconical portion, there.

being a. cylindrical recess concentric with said cylindricalwall. portion in the adjacent end of;

said member of suchdepthand diameter. as to. snugly receive the prongsof said tube.

LEWIS .HOPPS.

REFERENCES CITED The following references are of record inthe.

file of this patent:

UNITED STATES PATENTS Number Name Date 1,069,539 Evans Aug. 5, 1913 1,375,291 Hubble Apr. 19, 1921 1,640,970 Westerman Aug. 30, 1927. 2,101,451 Protin Dec.,7, 1937' 2,102,421 Kuehni ,Dec. .14, 1937 2,211,613 Bowie ,.Aug .,.l3,,1940i 2,251,897 Severn- 1 Aug..5.,' 194=l 2,440,009 Graham Apr. 20, 1948 2,456,474 Wainwright Dec. 14, 1948 2,460,609 Torsch Feb. 1, 1949 FOREIGN PATENTS" Number Country Date 584,290 Great Britain Jan. 10, 1947 

